ISO 15671:2023

Rubber and rubber products — Determination of total sulfur content using an automatic analyser

This document specifies an instrumental (automatic analyser) method for the determination of total sulfur in rubber and rubber products.

Caoutchouc et additifs pour caoutchouc — Dosage du soufre total à l'aide d'un analyseur automatique

General Information

• Status: Published
• Publication Date: 13-Feb-2023
• ICS: 83.060 - Rubber
• Technical Committee: ISO/TC 45/SC 2 - Testing and analysis
• Drafting Committee: ISO/TC 45/SC 2/WG 5 - Chemical tests
• Current Stage: 6060 - International Standard published
• Start Date: 14-Feb-2023
• Due Date: 09-Jul-2022
• Completion Date: 14-Feb-2023

Relations

• Revises: ISO 15671:2000 - Rubber and rubber additives — Determination of total sulfur content using an automatic analyser
• Effective Date: 15-Dec-2017

Standards Content (Sample)

ISO/DISFDIS 15671:2022(E)
Date: 2022-11-09
ISO TC 45/SC 2/WG 5
Secretariat: JISC
Rubber and rubber products — Determination of total sulfur content using an automatic
analyser
Caoutchouc et additifs pour caoutchouc — Dosage du soufre total à l'aide d'un analyseur automatique

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ISO/DISFDIS 15671:20192022(E)
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no
part of this publication may be reproduced or utilized otherwise in any form or by any means,
electronic or mechanical, including photocopying, or posting on the internet or an intranet, without
prior written permission. Permission can be requested from either ISO at the address below or
ISO's member body in the country of the requester.
ISO Copyright Office
CP 401 • CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Email: [e-mail]
Website: www.iso.org
Published in Switzerland.
Formatted: Font: 11 pt
Formatted: Line spacing: Exactly 11 pt
2 © ISO 2018 – All rights reserved
ii © ISO 2022 – All rights reserved

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ISO/DISFDIS 15671:20192022(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO
collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directiveswww.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any
patent rights identified during the development of the document will be in the Introduction and/or on
the ISO list of patent declarations received (see www.iso.org/patentswww.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the World
Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see
www.iso.org/iso/foreword.htmlwww.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 45, Rubber and rubber products,
Subcommittee SC 2, Testing and analysis.
This second edition cancels and replaces the first edition (ISO 15671:2000), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— Anan alternative detector to determine sulfur dioxide has been added.;
— Samplingsampling and preparation of test piece have been added.;
— Precisionprecision statement has been updated in Annex A.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at
www.iso.org/members.html.www.iso.org/members.html.
Formatted: Font: 11 pt
Formatted: Line spacing: Exactly 11 pt
© ISO 2018 – All rights reserved 3
© ISO 2022 – All rights reserved iii

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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 15671:2022(E)

Rubber and rubber products — Determination of total sulfur
content using an automatic analyser
WARNING 1 — Persons using this document should be familiar with normal laboratory practice. This
document does not purport to address all of the safety problems, if any, associated with its use. It is the
responsibility of the user to establish appropriate safety and health practices and to determine the
applicability of any other restrictions.
WARNING 2 — Certain procedures specified in this document might involve the use or generation of
substances, or the generation of waste, that could constitute a local environmental hazard. Reference
should be made to appropriate documentation on safe handling and disposal after use.
1 Scope
This document specifies an instrumental (automatic analyser) method for the determination of total
sulfur in rubber and rubber products.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 123, Rubber latex — Sampling
ISO 124, Latex, rubber — Determination of total solids content
ISO 1795, Rubber, raw natural and raw synthetic — Sampling and further preparative procedures
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminologicalterminology databases for use in standardization at the following
addresses:
— ISO Online browsing platform: available at https://www.iso.org/obphttps://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/https://www.electropedia.org/
3.1
sample
unit selected to represent the material to be analysed
3.2
test piece
© ISO 2022 – All rights reserved 1

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ISO/FDIS 15671:2022(E)
actual material used in the analysis
3.3
control sample
material with a recognized content of sulfur, analysed with each set of test pieces
4 Principle
4.1 Specified here is a reliable, rapid, instrumental (automatic analyser) method for determining total
sulfur in rubber and rubber products. The sulfur is determined by a single instrumental procedure
consisting of weighing a test piece, placing it in the instrument and initiating the (subsequently
automatic) analytical process. The analysis may be controlled manually to a limited degree, and a
capability to perform computations automatically may be provided by the instrument used to perform
the analysis.
4.2 The actual process can vary substantially from instrument to instrument because a variety of means
can be used to meet the primary requirements of the method. The method includes the following:
a) conversion of sulfur-containing materials to sulfur dioxide in an oxygen stream;
b) determination of the sulfur dioxide by one of three detection schemes, and hence the total sulfur
content.
4.3 In the hydrogen peroxide detection configuration, the sulfur dioxide is absorbed in hydrogen
peroxide, converting sulfur dioxide to sulfuric acid which is subsequently titrated with standard alkali,
enabling the sulfur to be calculated.
4.4 In the iodine solution detection configuration, the sulfur dioxide is absorbed in standard iodine
solution, reducing iodine to iodide which is subsequently measured by a polarized dual platinum
electrode system, enabling the sulfur to be calculated.
4.5 In the sulfur dioxide detection configuration, the sulfur dioxide is passed through an infrared
absorption detector or thermal conductivity detector or any equivalent detector and determined using a
sulfur dioxide standard, enabling the sulfur to be calculated.
5 Requirements for apparatus
5.1 Because a variety of instrumental (automatic analyser) component configurations can be used
satisfactorily for this method, no specifications are presented with regard to overall system design.
Functionally, however, the following requirements are specified for all instruments.
5.2 The conditions for combustion of the sample shall be such that (for the full range of applicable
samples) sulfur-containing components shall be converted completely to sulfur dioxide. General
instrumental conditions that affect complete combustion include:
a) availability of the oxidant,;
Formatted: Font: 11 pt
Formatted: Space Before: 18 pt, Line spacing: Exactly
b) temperature,;
11 pt
2 © ISO 2019 – All rights reserved
2 © ISO 2022 – All rights reserved

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ISO/FDIS 15671:2022(E)
c) time.
5.3 For the configuration described in 4.3, a correction shall be made for acidity when chlorine is present
by titration of a port
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 15671
ISO/TC 45/SC 2
Rubber and rubber products —
Secretariat: JISC
Determination of total sulfur content
Voting begins on:
2022-11-17 using an automatic analyser
Voting terminates on:
Caoutchouc et additifs pour caoutchouc — Dosage du soufre total à
2023-01-12
l'aide d'un analyseur automatique
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 15671:2022(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2022

---------------------- Page: 1 ----------------------
ISO/FDIS 15671:2022(E)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 15671
ISO/TC 45/SC 2
Rubber and rubber products —
Secretariat: JISC
Determination of total sulfur content
Voting begins on:
using an automatic analyser
Voting terminates on:
Caoutchouc et additifs pour caoutchouc — Dosage du soufre total à
l'aide d'un analyseur automatique
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: [phone]
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: [e-mail]
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 15671:2022(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN­
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
  © ISO 2022 – All rights reserved
NATIONAL REGULATIONS. © ISO 2022

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ISO/FDIS 15671:2022(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Requirements for apparatus .2
6 Reagents . 3
7 Instrument (automatic analyser) preparation and calibration .3
8 Sampling and preparation of test portion . 3
9 Procedure .4
10 Calculation . 4
11 Precision . 4
12 Test report . 4
Annex A (informative) Precision . 5
Bibliography . 6
iii
© ISO 2022 – All rights reserved

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ISO/FDIS 15671:2022(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non­governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 45, Rubber and rubber products,
Subcommittee SC 2, Testing and analysis.
This second edition cancels and replaces the first edition (ISO 15671:2000), which has been technically
revised.
The main changes are as follows:
— an alternative detector to determine sulfur dioxide has been added;
— sampling and preparation of test piece have been added;
— precision statement has been updated in Annex A.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
  © ISO 2022 – All rights reserved

---------------------- Page: 4 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 15671:2022(E)
Rubber and rubber products — Determination of total
sulfur content using an automatic analyser
WARNING 1 — Persons using this document should be familiar with normal laboratory practice.
This document does not purport to address all of the safety problems, if any, associated with its
use. It is the responsibility of the user to establish appropriate safety and health practices and to
determine the applicability of any other restrictions.
WARNING 2 — Certain procedures specified in this document might involve the use or generation
of substances, or the generation of waste, that could constitute a local environmental hazard.
Reference should be made to appropriate documentation on safe handling and disposal after
use.
1 Scope
This document specifies an instrumental (automatic analyser) method for the determination of total
sulfur in rubber and rubber products.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 123, Rubber latex — Sampling
ISO 124, Latex, rubber — Determination of total solids content
ISO 1795, Rubber, raw natural and raw synthetic — Sampling and further preparative procedures
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
sample
unit selected to represent the material to be analysed
3.2
test piece
actual material used in the analysis
3.3
control sample
material with a recognized content of sulfur, analysed with each set of test pieces
1
© ISO 2022 – All rights reserved

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